| A | B |
|---|
| consciousness | awareness of oneself and one's environment |
| construct | a theoretical concept |
| preconscious | information that is not conscious but can be recalled into consciousness |
| unconscious | information that is unavailable to awareness |
| nonconscious | bodily activities that occur without our awareness |
| altered state of consciousness | consciousness other than normal waking consciousness |
| circadian rhythm | the sequence of biological processes that occur in a day |
| REM sleep | stage of sleep in which dreaming occurs; characterized by rapid eye movements |
| insomnia | the inability to sleep |
| night terror | sleep disorder characterized by arousal and terror, usually not remembered in the morning |
| sleep apnea | interruption of breathing during sleep |
| narcolepsy | condition in which a person suddenly falls asleep |
| Stage 1 sleep | lightest stage of sleep |
| Stage 4 sleep | deepest stage of sleep |
| nightmare | a disturbing dream, occurs during REM sleep |
